Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Micro and Nanofluidics
CPP 30.6: Poster
Mittwoch, 24. März 2010, 17:30–19:00, Poster C
Wetting of grooved elastic substrates - a theoretical study — •Dominik Michler1,2, Ralf Seemann1,2, and Martin Brinkmann1 — 1Max Planck Institute for Dynamics and Self-Organization, D-37073 Göttingen — 2Experimental Physics, Saarland University, D-66123 Saarbrücken, Germany
The wetting of an elastic substrate decorated with a periodic pattern of parallel ridges of rectangular cross section is considered theoretically. A high aspect ratio of the ridges separating two neighbouring grooves allows us to employ Krichhoff's theory for the elastic deformation of thin plates to compute their deformations due to interfacial tension and Laplace pressure. We start our investigation with liquid structures of constant cross section perpendicular to the ridges. On this basis a complete morphology diagram of the liquid can be derived, where the appearance of certain morphologies is given depending on the groove geometry, substrate elasticity, and wettability. Using this quasi-2D approach we first calculate the deformation of the ridges of a single groove filled by liquid. For the case of an array of parallel ridges we predict an ordering of liquid structures in neighbouring grooves. This ordering effect is due to the deformation of the ridges, which leads to changes in the cross section of neighbouring grooves. The theoretical predictions will be compared with experimental results.